AMDRO Ant Block is rich in the proteins and carbohydrates that ants find irresistible. Combined with the delayed reaction of the stomach toxicant Hydramethylnon, AMDRO Ant Block capitalizes on the instinctual behavior of most foraging ants to bring food back to the colony. Which is why AMDRO Ant Block effectively controls up to 15 species of ants, including harvester ants, Argentine ants, Texas leafcutting ants and wood-destroying carpenter ants.TREATS 540 LINEAR FEET.